How can I verify that my H Tuner Stage 1 camshafts are authentic Skunk2?

H Tuner Stage 1 camshafts will be hand-etched on the distributor end. They will be marked with S7 on the Intake cam and S9 on the exhaust cam. Newer H Tuner Stage 1 camshafts will also have S2 cast into the camshaft core in between the lobes.